Mad Dog Robot

Step 10 Moving Platform Mechanism

Using 1/8 thick, half-inch wide aluminum bar stock; fabricate the inverted U bracket as shown in the photo. With the inverted U bracket centered within the three-quarter inch wide slot of the moving platform (part A), position center of U bracket vertical slot 6 inches from the rear edge of the main base. Drill two 5/16 mounting holes in the base (part C) and install T-nuts in those holes, and then attach U bracket using ¾ long hex head cap screws.

Fabricate from 1/16 thick steel (electrical junction box cover), an L bracket to mount the wiper motor, see photos.

Using wood glue mount the wiper motor elevation platform [part D] the as shown in the photo. Install wiper motor to L bracket and position the ball ended arm at three o'clock - the full forward position. With the ball engaged within the inverted U bracket and the movable platform fully rearward, mark the location for the L bracket mounting holes. Using 1 1/2 inch long quarter-inch carriage bolts, nuts, and washers attach the L bracket to the movable platform, see photos.

Using sheet-metal, fabricate an L bracket which attaches to the rear of the base (part C) such that it catches a microswitch mounted at the rear of the movable platform, see photos. The microswitch should trip as it contacts the L bracket mounted to the base.